text: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #pragma once
  
  #include "common.h"
  #include "dex_format.h"
  
  #include <vector>
  
  namespace ir {
  
  // A simple index tracking and allocator
  class IndexMap {
   public:
    dex::u4 AllocateIndex() {
      const auto size = indexes_map_.size();
      while (alloc_pos_ < size && indexes_map_[alloc_pos_]) {
        ++alloc_pos_;
      }
      MarkUsedIndex(alloc_pos_);
      return alloc_pos_++;
    }
  
    void MarkUsedIndex(dex::u4 index) {
      if (index >= indexes_map_.size()) {
        indexes_map_.resize(index + 1);
      }
      SLICER_CHECK(!indexes_map_[index]);
      indexes_map_[index] = true;
    }
  
   private:
    std::vector<bool> indexes_map_;
    dex::u4 alloc_pos_ = 0;
  };
  
  }  // namespace ir
  